reinit Serial after USBHIDKeyboard usage

[SuGlider]

Discussed in #10308

^{Originally posted by eadmaster September 7, 2024}
example

USBHIDKeyboard Kb;
Kb.begin();
USB.begin();
Kb.print("foo");
//..
//reinit serial when finished
Kb.end();
//USB.~ESPUSB(); // Explicit call to destructor 
Serial.begin(115200);
Serial.println("this should appear");  // does not work!
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